Windows 8 Compatibility Page: http://www.presonus.com/news/press_releases/Windows-8-Compatibility-Statement-for-PreSonus-Products
If you own a newer PC with Windows 8 installed as the Operating System software environment, you will need to have at least Version 2.6 of Studio One installed. For many customers that have a physical installation CD/DVD, the version on the disc has a high likelihood of being older than this.
PLEASE DO NOT INSTALL Studio One 2 from a CD or DVD Disc!!!
Instead, download the most current release for Studio One following the instructions on this Knowledge Base Document: http://support.presonus.com/entries/21879320--2-Software-Installation